Tool-holder.



W. A. KELSEY.

TOOL HOLDER.

APPLICATION FILED JULY 15, 1913.

l, 113,650. Patented 00h13, 1914.

Qwww H65 UNirnn siirrns @PATENT onnion WILLIAM A, KELSEY, or MINNEAPOLIS, MINNESOTA.

I Toon-HOLDER.

Specication of Letters Patent.

Patented Oct. 13, 1914.

Application ined Iuiy i5, 1913. seriai N9. 779,199.

' ing tools during the grinding operation and is designed-rparticularly foruse as a -dental tool holder. p

The object-of my invention is to provide a holder by means of which instruments for delicate work, havingsmall or angular grinding faces, can be securely held' and accurately ground, preserving the original angle on the cutting edge or face of the tool with respect to the shank. In small instruments, such as are used in dental work', it is extremely difficult to hold the tool in the'v hands during the grinding operation and maintain the proper angle on the face of the tool and the cutting edge.

" With my invention the tool may be sup` ported in any position or at any desired angle, and its cutting edge easily and accurat/ely ground. V

The invention vconsists generally in various constructions and combinations, all as hereinafter described and particularly pointed out in the claims.

In the accompanying 'drawings forming part-ot thisspecitication, Figure 1 is a front elevation `of a tool holder embodying my invention, Fig. .2 is a view, partially in section, of the holder removed from its support and'showing amodified means for supporting the grinding stone thereon, Fig. 3ds a plan section of' the 'device illustrated in Fig. 2, F ig.` 4 is adetail'sectional view showing t-he support for the grinding device andthe means for tilting it to any desired angle, Fig. 5 is a`det-ail view of a support for the Agrinding device, which may be substituted for the one illustrated in Fig. 1.

'In the drawing, 2 represents a plate having keyyhole slots 3 therein adapted to receive screws 4 for supporting the device on a bench. A tube 5 has its inner end seated on .the plate 2 and an arm 6 is provided at one end with a curved surface 7 that is seated against the open outer end of the tube and cooperates therewith to form a ball and socket bearing for said arm. The lower end of the arm has a comparatively large opening 8 and a rod 9 passes through this opening and is secured inthe plate 2 Iand carries a washer 10 having a curved surface to bear on the lower end of the arm and cover the opening 8, the outer end of said rod being threaded to receive a thumb nut 11 by means of which the f waslierl() can be clamped on the arm and the arm and tube readily secured together at any desired angle. sufficientsize to allow the arm 6 to be rocked .backend forth and adjusted in diiierent positions with respect to the supporting plate 2112A socket v12 is provided in said arm anda'threaded stud 13 fits losely within said socket and is provided with la split,A 'threade/dring 14 that is sea-ted againstthe'- end 'ofthe arm and'when rotated. moves thel stud-backf-'and forth in the socket. Onthe outerend. of the stud a clamp 15 is mounted, having .a clamping screw 16 for securing the driving'jniember 17 between the jaws of the clamp; On this driving member the grinding wheel 18 is mounted. This maybe of stone or emery, as preferred. I prefer to providea clamping screw 19 in the arm 6 in position to engage the threaded stud 13. By

means of this adjustable stud and the aiin capa-bleef movement in either direction I am able to set the 'grinding stone at any de' sired angle with respect to the work.v

The opening 8 is of In Fig. 2I have shown a modified conj struction" of the means mounted on the arm' 6, which consists in a disk 20 having an ear 21 pressed or punched therefrom and provided with an opening to receive a sleeve 22.'

A stud 23 passes through the upper end of the arm and through the ear and sleeve and is provided with a thumb nut 24 between which and the ear a washer 25 is arranged. By loosening the thumb nut 24- the disk 20 may be tilted from a horizontal to Tan inclined position. This disk has a fiat upper surface and is ladapted to support a second disk 26 having clamping jaws 27 pressed or punched therefrom and adapted to grip the driving shaft 17 and provided with a clamping screw 28. When the driving shaft is mounted in these jaws the operator, using the disk 20 as a support, can slide the disk 26 back and forth or ina circular direction thereon and move the grinding wheel to any desired position with respect to the face of the too-l to be sharpened.

In Fig. 5 another modification is shown,

This bar 29 has an opening therein to receive the screw 23 of the supporting stud and a thumbnut, similar to-the one described, is also provided.

The plate 2 is provided with an arm 31 projecting outwardly therefrom and a bracket 32 is supported on said arm by means ofa screw 33 and a thumb nut 34. The arm is preferably marked at the top and graduations are preferably provided on the bracket 32 and movable past the mark on the arm when said bracket is oscillated on its support. These graduations on the bracket denote certain adjustments and enable the operator to swing the arm and secure it at any desired angle with respect to the supporting plate. A screw 35 is tapped into the bracket 32 and a disk 36 is mounted on said screw and secured against rotation thereon by a set screw 37. A block 38 is also loosely mounted on said screw and free to turn thereon, but held against longitudinal movement, and has a bearing on one side against the disk 36. One end of the block 38 forms a stationary jaw 39 that is provided with a rocking face 4Q supported on j by a thumb nut 45. An adjusting screw 46 is mounted in the block 38 and engages the movable jaw 42 for adjusting it back and forth toward and from the oscillating face 40 ofthe fixed jaw. Between these faces the dental tool or other instrument to be sharpened is-inserted, and upon tightening the screw 46 the tool will vbe` securely fastened between the jaws and when the block 38 has been adjusted tothe desired angle with respect to the grinding wheel the edge of the tool can be accurately and quickly ground without danger of destroying or changing the angle of the tool face. I may also provide graduations on the block 38 for convenience of adjustment.

I claim as my invention l. A tool holder comprising a supporting member, a jaw adapted for supporting a grinding device and having a ball and socket bearing on said supporting 'member and capable of adjustment at any desired angle Awith respect thereto, and a tool clamp carlried by said member and having' a rotary jaw-being capable of adjustment in a direcp tion at right angles substantially to the plane of said member, and a tool clamp carried by said member and rotatively adjustable thereon.

4. A tool holder comprising a supporting member, an arm mounted thereon and having freedom of adjustment with respect to said member, a grinding device support mounted on said arm and capable of adjustment therewith or independently thereof, and a tool clamp carried by said member and capable of rotary adjustment thereon.

' 5. A tool holder comprising a supporting member, means for securing a grinding device at any angle with respect to said member, and a tool clamp carried by said member and capable of adjustment with respect to said securing means, whereby said grinding device may be seated at any desired angle to it any cutting edge of a tool mounted in said clamp.

In witness whereof, I have hereunto set my hand this 11th day of July, 1913.

WILLIAM A. KELSEY.

Witnesses:-

GENEviEvE E. SoRENsEN, C. H. REHFUss. 

